Machine tool



Jan. 29, 1963 K. P. HERNLEY MACHINE TOOL 2 Sheets-Sheet 1 Filed Dec. 1, 1958 INVENTOR. A WA 'rh' R Ham/ V Jan. 29, 1963 K. P. HERNLEY 3,075,320

MACHINE TOOL Filed Dec. 1, 1958 2 Sheets-Sheet 2 INVENTOR. K'N/VETH P. mam 45y atent 3,075,320 Patented Jan. 29, 1963 free $617532!) MACHTNE TQGL Kenneth P. Hernley, Burton, Wash, assignor, by mesne assignments, to Phiibrick-Strickland Laminates, Inc a corporation of Washington Filed Dec. 1, 1953, Ser. No. 777,304 1 Claim. (Cl. 5135) This invention relates to a machine tool and more particularly to a grinding mechanism.

An object of this invention is to provide a new and mproved grinding mechanism in which a constant working diameter for the grinding wheel is achieved.

Another object of this invention is to provide a grinding mechanism having a shaft adapted to support a grinding wheel having a spherical segmental shape with the grinding surface coincident with the surface of a theoretical sphere of which it is a segment, and means for varying the position of said wheel in a direction longitudinally of said shaft to maintain the grinding surface of said wheel coincident with the surface of the sphere as the grinding wheel is reduced due to wear thereof.

Another object of the invention is to provide a grinder mechanism comprising, a carriage movable in a path.

generally parallel to a surface to be ground and having a template follower, a template, means urging the carriage into following relation with said template, a grinder mount mounted on said carriage for pivoting about an axis and having a driven shaft adapted to support a grinding wheel with a spherical segmental shape and the grinding surface coincident with a sphere, said axis coinciding with the center of the sphere, means for spacing the grinding wheel longitudinally of the driven shaft to maintain the grinding surface coincident with the sphere as the surface wears, and means for adjusting said grinder mount about said axis to distribute the wear on said grinding surface.

Further objects and advantages will become apparent from the following detailed description taken in connection with the accompanying drawings in which:

FIG. 1 is a fragmentary front elevational view of the grinding mechanism shown in association with an article to be ground and showing the supporting carriage in a full line position and a second broken line'position;

FIG. 2 is a plan section taken generally along the line 22 in FIG. 1;

FIG. 3 is a diagrammatic view showing the grinding wheel in one position of adjustment thereof and in association with a work piece;

FIG. 4 is a view similar to FIG. 3 showing the grinding wheel in a different adjusted position; and

FIG. 5 is a view similar to FIGS. 3 and 4 showing the grinding wheel in a position of tilted adjustment.

While this invention is susceptible of embodiments in many different forms, there is shown in the drawings and will herein be described in detail an embodiment of the invention with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the invention to the embodiment illustrated. The scope of the invention Will be pointed out in the appended claim.

The grinder mechanism of this invention is shown in association with apparatus generally of the type disclosed in the application of Edward T. Strickland and Homer C. Amos, Serial No. 756,189 filed August 20, 1958, in which an article to be machined is supported on a rotary turntable 11 driven by drive belts 12 and 13. A frame leg 14 extends upwardly alongside the article 10 and generally parallels the surface of the article to be ground by the mechanism disclosed herein.

The frame leg 14 slidably mounts a base member 15 having a carriage 16. The carriage is mounted on the base by a parallelogram system including arms 17 and 18 pivotally mounted to the base 15 by bearings 19 and 20, respectively, and to the carriage arm by bearings 21 and 22, respectively. A weight 23 is connected to the mounting arm 18 in a position to urge the carriage toward the left as viewedin FIG. 1 to subject the position of the carriage to the control of a template.

Two different template and template follower mechanisms are disclosed. If the lower surface of the article 10 is not to be symmetrical about its axis, the turntable 11 is used as a template whereby a template follower 25 mounted on a downturned leg 26 of the carriage 16 engages the turntable surface to control the position of the carriage. When the surface of the article 10 above a certain point is to be symmetrical about the axis thereof, the control of the carriage position is obtained by the template 30 attached to the frame leg 14. If the entire surface of article 10 is to be symmetrical then a longer template 30 may be used without the use of a turntable template. A template follower roller 31 mounted on the carriage 15 coacts with the template 30 to control the position of the carriage as shown in broken line in FIG. 1.

The carriage 16 is caused to move along the frame leg 14 by hydraulic piston and cylinder mechanism including a cylinder 32 secured to the frame leg and a piston rod 33 extending from the cylinder and connected to the base member15.

The carriage 16 supports a grinder mount 40 by a pair of spaced apart plates 41 and 42 which receive a pair of oppositely extending pins 43 and 44, respectively, extending outwardly from the grinder mount 40. The grinder mount 40 carries a drive motor 45 which drives a drive shaft 46 adapted to carry a grinding wheel 47. The grinding wheel is secured to the lower end of the drive shaft 46 by a washer 48 and a nut 49 threadably attached to the lower end of the drive shaft.

The grinding wheel 47 has a spherical segmental shape with the bases of said segment extending normal to the length of the drive shaft 46. Referring to FIGS. 3 and 4, it will be noted that the surface 47a of the grinding wheel 47 is coincident with a broken line 48 representing the surface of a theoretical sphere with the center of the sphere coincident with an axis defined by the pivot mounting pins 43 and 44 of the grinder mount 40.

In the position of the parts shown in FIG. 3, a fullsized grinding wheel 47 is shown in which the wheel is adjacent the pivot pin 44 and the surface 47a of the wheel is coincident with the surface of the sphere 48. After use of the grinding wheel and reduction in size thereof, the surface of the wheel is no longer coincident with the surface of the theoretical sphere. An effective constant working diameter is achieved by lowering the grinding wheel longitudinally of the drive shaft 46 to again make the grinding surface 47a coincident with the surface of the sphere 48. This repositioning of the grinding wheel is accomplished by placing a shim 50 between the upper side of the grinding wheel and the drive shaft 46.

This adjustment contributes to a substantial degree of accuracy in the mechanism since the distance between the template 3i and the pivot pins 43 and 44 for the grinder mount is maintained constant and the distance between the surface of the grinding wheel and the pivot pins 43 and 44 is maintained constant.

To provide for even wearing of the face 47a of the grinding wheel, the grinder mount 40 may be adjusted about an axis coinciding with the center of the sphere 48 by a link 51 connected to the grinder mount 49 and releasably attached to a bracket 52 carried on the carriage 16. The link 51 is attached to the bracket 52 by bolt means 53.

Adjustment of the grinder mount 40 about an axis coincident with the center of the sphere 48 moves the grinding surface along the contour of the sphere 48 and distributes the wear across the entire surface 47a of the grinding wheel. be noted by comparing FIGS. 3 and 5.

The wheel may be dressed whenever required, and this may be accomplished by hinging a dressing tool for movement about an axis extending through the center of the sphere 48.

I claim:

A grinder mechanism comprising, a carriage movable in a path generally parallel to a surface to be ground and having a template follower, a template, means urging said carriage into following relation with said tem plate, a grinder mount mounted on said carriage for pivoting about an axis and having a driven shaft, a grinding wheel opera-bly mounted on said shaft having a spherical segmental shape and a grinding surface coin- DifiEerent positions of adjustment may' cident with a theoretical sphere, said axis and shaft passing through the center of the sphere, means for accurately spacing the grinding wheel longitudinally along the driven shaft to maintain the grinding surface coincident with the sphere as the surface wears, and means for pivotally adjusting said grinder mount about said axis to move the grinding surface along the contour of the sphere insuring engagement with the surface to the ground and to distribute the wear on said grinding surface.

References Cited in the file of this patent UNITED STATES PATENTS 1,352,790 Danielsson Sept. 14, 1920 1,660,890 Schramm Feb. 28, 1928 2,391,733 Moreland Dec. 25, 1945 2,497,217 Hall Feb. 14, 1950 2,600,815 Turner June 17, 1952 2,646,651 Wilson July 28, 1 953 

